Update: So far so good! He only has about 3 days left on his medication and I've seen a marked improvement in his droppings as well as his overall mood
he's eating, drinking and playing normally, but I'm still being very cautious and keeping a close eye on him.
I spoke with his regular vet the other day to update her and based off of the info I gave her, she said that it sounds like he should be just fine
Thank you all so much for your advice and caring messages, it has really helped me through this whole ordeal